Method for maintaining the integrity of a dual microprocessor multiprocessing computing system
US4558416A · kind A · utility
25Cited by
6References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 27, 1983 |
| Grant date | Dec 10, 1985 |
| Priority date | — |
| Expiry date | May 27, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/0763
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A dual microprocessor computing system is used to control an engine in a motor vehicle. Each system contains a Personality Programmable Read Only Memory (PPROM) containing system calibration data that is transferred from the PPROM to the read-write memories in the microprocessors. In order to identify each PPROM a byte of memory contains a check sum and a byte of the microprocessor memory contains an identical check sum. During data transfer, the check sums are compared. Also during data transfer, the amount of data being transferred within a predetermined interval is counted both at the transmitter and the receiver memories.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.